Honeycomb roll

ABSTRACT

An improved cylindrical suction roll suitable for carrying a foraminous screen thereon for forming paper, said cylindrical roll being of the type formed by alternating straight and undulating strips attached to one another and running axially between end members, and the improvement comprising the projection of said straight strips radially beyond said undulating strips to form unitary, circumferentially spaced, continuous axial supports for outer meshed layers. The projecting straight strips are firmly anchored in the honeycomb openwork of the roll by notching the nodes of the undulated strips and applying fillet welds in the notches to create a countersink, or tapered edge, in the area of attachment.

United States Patent Edward T. Bryand South Portland, Maine [21] Appl.No. 738,213

{22} Filed June 19, 1968 [45] Patented July 6, 1971 [73 l AssigneeMetal-Tech, Inc.

Biddeford, Maine [72) Inventor {54} HONEYCOMB ROLL l0 Claims, 6 DrawingFigs.

[52] U.S. Cl 29/121, 210/402 [5l] lnt.Cl D21! 3/10 [50] Field of Search29/121,

124, 125, 129, 130, 121 A, 123, 148.4, 455; 162/357, 368, 367, 372;210/402, 403, 404; 161/68,l27,126,l35

[56] References Cited UNITED STATES PATENTS 3,100,928 8/1963 Bryand29/121 3,105,043 9/1963 Rich et al 162/368 X 3,259,961 7/1966 Bryand29/l48.4 FOREIGN PATENTS 525,753 5/1955 ltaly 29/455 PrimaryExaminer-Walter A. Scheel Assistant Examiner-Leon G. MachlinAttorney-Pearson & Pearson ABSTRACT: An improved cylindrical suctionroll suitable for carrying a foraminous screen thereon for formingpaper, said cylindrical roll being of the type formed by alternatingstraight and undulating strips attached to one another and runningaxially between end members, and the improvement comprising theprojection of said straight strips radially beyond said undulatingstrips to fonn unitary, circumferentially spaced, continuous axialsupports for outer meshed layers. The projecting straight strips arefirmly anchored in the honeycomb openwork of the roll by notching thenodes of the undulated strips and applying fillet welds in the notchesto create a countersink, or tapered edge, in the area of attachment.

PATENTEU JUL 61971 snm 1 ur 2 INVENTOR. Edward T. Brycmd BY *p 2 z ,z an v-P AT TORNEYS PAENEuJuL sien 3590.453

SHEET 2 UF 2 A TTORNEYS HONEYCOMB ROLL BACKGROUND OF THE INVENTIONCylindrical honeycomb and half-hexagonal rolls are known to the art andhave gained wide acceptance in a large number of heavy duty applicationswhere a high ratio of strength to open area is desirable, as for examplein cylindrical suction rolls and other type of filter support media.

lt has now been discovered that an improvement in such rolls as havebeen described in U.S. Pat. Nos. 3,100,928 and 3,259,961 issued toEdward T. Bryand allows such apparatus to have unexpected advantagesover other types of rolls in such applications as papermaking and thelikes, wherein a Fourdrinier wire is trained over a breast roll forpassing the paper stock or other composition through a dewateringaction.

For example, in U.S. Pat. No. 2,418,600 to Ostertag et al., of Apr. 8,1947, a breast roll is disclosed which comprises a relatively thickwalled hollow roll having countersunk drilled perforations, axiallymilled grooves, projecting axial blades seated in the grooves, notchesin the blades, continuous circumferential steel tapes yet in the notchesand an overall cover of heavy screen mesh, all for supporting aFourdrinier wire. lt will be understood that such a structure is costlyto assemble, subject to inadvertent displacement of the parts andconstitutes a considerable barrier to the passage of liquid into theinterior of the roll and to the application of suction from the rollinterior to the liquid in the outer periphery ofthe roll.

In the device of this invention, the roll is a unitary hollowcylindrical honeycomb openwork formed of alternate straight andundulated thin strips of metal extending axially from one end support tothe other. The straight strips extend outwardly beyond the undulatedstrips to also form axial blades, or baffles, which cannot becomedisplaced because welded into the openwork. The outer extremities of thestraight strips may be notches to receive the conventional stainlesssteel tapes for supporting thy conventional meshed outer layer, or alayer of thin honeycomb openwork may be supported on the straight stripsfor the same purpose.

By honeycombed rolls as used hereafter in this specification is meantany roll of the general type described in the aforementioned U.S. Pat.No. 3,259,961, wherein undulated strips are spaced by straight strips.Said undulated strips include half-hexagonal bent strips or any of thefunctional equivalents thereof.

SUMMARY OF THE INVENTION Therefore it is an object of the invention toprovide an improved breast roll suitable for supporting a Fourdrinierwire during papermaking.

It is another object of the invention to provide an improved suction ordewatering roll for use in conjunction with a head box.

Another object of the invention is to provide an improved honeycombroll.

Still another object of the invention is to provide a novel means offorming a breast roll whereby weight savings, economy, and increasedflow through are achieved without shortening the effective life of thepapermaking apparatus or losing any performance characteristics thereof.

AN ILLUSTRATIVE EMBODIMENT OF THE INVENTION FIG. l is a front elevation,partly in section, of a cylindrical roll constructed in accordance withthe invention;

FIG. 2 is a fragmentary enlarged perspective section of the honeycombstructure according to the invention, slotted for supporting tapes;

FIG. 3 is a fragmentary enlarged plan view of the structure` shown inFIG. I;

FIG. 4 is a view along the section line 4-4 of FIG. l, showing the rollof the invention in use as a breast roll in a Fourdriniertype papermachine;

FIG. 5 is a perspective view of another embodiment of the invention; and

FIG. 6 is a perspective view of still another embodiment of thyinvention. Referring to FIG. I, it is seen that a cylindrical roll l5includes a pair of oppositely disposed, parallel, longitudinally spaced,circular end members I6 and 17, with the hollow, cylindrical, honeycombopenwork I8 extending therebetween. Each end member is preferablysupported on a stationary hollow bearing journal 19 by means of abearing plate 20 and bearing 21, the hollow journal forming a fluidconduit 22 connecting the interior of the roll to a source of suction23. Each end member also includes an annular, peripheral inner face suchas 25 or 26, the faces 25 and 26 preferably being flat, smooth, andnormal to the longitudinal axis of the roll. The end members are slottedand are, con veniently, in the form of circular flanged rings 27detachably secured to bearing plates 20.

The hollow cylindrical honeycomb openwork 18 has a generally cylindricalouter face 28 and cylindrical inner face 29 and is formed of thin metalstrips of stainless steel, said strips upstanding on edge and bent toform radially extending flow passages into the interior of the roll.Openwork 18 consists of a plurality of alternate straight strips such as31, 32 and 33 and undulated, sinuate or half-hexagonally bent strips 34and 3S, the strips extending axially from the inner face 25 of one endmember to the opposite inner face 26 of the other end member. The termsundulate and sinuate are used herein to include half hexagonal bentstrips, or any equivalent configuration which will produce a usefulpattern of flow passages, a useful embossing pattern or the like.

The preferred configuration, however, is that wherein nodes 36 and 37 ofadjacent bent strips are oppositely disposed to form a series ofhoneycomb-shaped conduits split by a straight strip such as 32.

It is the particular relationship of the straight strip 32 to the bentstrips such as 34 and 35 which constitute a major improvement of theinvention. A complementary improvement is the configuration of the bentstrips such as 35 and the means by which they are attached to straightstrips.

Referring to FIGS. 2 and 3, it is seen that straight strips such as 31are elevated above bent strips such as 34 by an altitude 38 which ispreferably less than the altitude 40 of that portion of strips such as31 which are in contact with bent strips such as 34.

As shown schematically in FIGS. 2 and 4, the upper edge portion 42 ofstrip 32 provides means for supporting a foraminous assembly 43 whichmay include circumferential steel tapes 44, seated in notches 45, ameshed screen 46, and a Fourdrinier wire 47.

It is also to be noted that nodes such as 36 of bent strips 34 arepartly cut out as at 50. These cutouts 50 may be punched or drilled incircular configuration, and provide means for securing bent strips suchas 34 to straight strips such as 32 without the necessity of havingthree thicknesses of metal at the points of attachment of nodes 36 tostraight strips such as 32. A countersunk shaped tapered fillet 51 iswelded, brazed, or otherwise applied within each cutout 50. Apparatusthus formed is easier to clean, and provides less resistance to airflow.Moreover, its fabrication is facilitated by the extra work room and weldarea provided by cutouts 50 for the artisan to manipulate duringanchoring of nodes 36 to straight strips such as 32.

The honeycomb roll 15 with its radially projecting strips, or baffles,3l, 32 and 33, firmly anchored within, and integral with the honeycombopenwork by the weld fillets 51 in cutouts 50 of the recessed undulatedstrips 34 and 35, forms a series of full axial length, continuous liquidchambers 52 around the periphery of the roll in the plane of theprojecting portions 38 of the straight strips. Unlike breast rolls ofthe prior art, in which the bottom, or inner wall of such chambers isformed by a solid roll surface having countersunk drilled suction holes,the bottom, or inner wall 53 of roll l5 is substantially open andpermits free passage of fluid from the chambers 52 into the interior 54of the roll. At the only locations where three strip thicknesses arejoined, the outer edges thereof are tapered or beveled by the fillets 5lto constitute a single-thickness pointed edge, thereby increasingflow-through while avoiding a wide shelf effect upon which fibers inpaper stock could lodge and accumulate.

As shown in FlG. 5, the outer edges 42 of the projecting straight strips3l and 32 may be free of notches and support a suitable screen 46, andsuch a screen may be formed by a thin covering of honeycombed stainlesssteel strips 60, one-eighth inch thick or more, and constructed in themanner illustrated herein. ln such case, the thin honeycomb covering isinverted so that the projecting portion 6l ofthe straight strips 62 areon the inside for attachment by welding, brazing as at 63 or by othermeans, on the projecting portions 38 of the straight strips of the inneropenwork.

As shown in FlG. 6, the outer covering 60 can be circumferentiallyconstructed with the straight strips 66 running circumferentially, orslightly helically, to seat the projections 67 thereof in notches suchas 45.

For convenience of illustration, the openworks of FIGS. 5 and 6 are flatplanar, but it will be understood that, in forming a roll, the openworksare in curved planes.

What l claim is:

1. ln a rotary cylindrical roll of the type comprising a pair ofspaced-apart, parallel, circular end members each having an annularperipheral inner face and a plurality of alternate straight strips andbent strips, extending axially between and spaced around, the saidannular, inner faces of said members to form a cylindrical openwork,said bent strips each having uniformly spaced, flattened nodes inengagement with straight strips on each side thereof; and meansconnecting each said node to the adjacent straight strip for mutualsupport of said strips,

the improvement whereby said straight strips extend radially beyond saidbent strips, around said roll.

2. Apparatus as defined in claim l wherein the length of radialextension of said straight strips above said quantitative bent strips isless than the radial distance of said straight strips which is adjacentto said bent strips.

3. Apparatus as defined in claim l wherein circumferentially adjacentones of said bent strips are oppositely disposed to form ahoneycombed-type openwork.

4. Apparatus as defined in claim l wherein a portion of said nodes arecut out from at least the outer edges thereof and said connecting meansis a fillet weld partially filling said cutout to form a tapered face,thereby providing an improved fluid flow through the apparatus.

5. A honeycomb roll of the type having alternate straight and undulatedthin strips extending axially from one end ofthe roll to the other endto define a half hexagonal patterned openwork characterized by each saidstraight strip extending radially outward substantially beyond thecylindrical plane defined by said undulated strips, and anchoring means,in the said cylindrical plane of said undulated strips, securing saidstrips to the adjacent portions of said straight strips to form aunitary, integral openwork. 6. A roll as specified in claim 5, whereineach said straight strip includes a plurality of spaced notchestherealong for receiving and supporting the convolutions ofcircumferentially extending metal tapes, or strips. 7. A roll asspecified in claim 5, plus a hollow cylindrical, foraminous assembly,supported on the outer terminal edge portions of said straight strips,said assembly being adapted to support a Fourdrinier wire trainedpartially therearound. 8. A roll as specified in claim 5, wherein saidanchoring means comprises a plurality of cutouts, formed in at least thcouter edge of each node of said un dulates strips, and a fillet weldextending around the periphery of each cutout and securing each saidnode to the face of the adjacent straight strip. 9. A roll as specifiedin claim 8, wherein said fillet weld is beveled to form a sloping,outward-facing edge on each said cutout. l0. A honeycomb roll of thetype having alternate straight and undulated thin strips extending fromone end of the roll to the other end to define a half hexagonalpatterned openwork, said roll being characterized by an inner saidopenwork on said roll, said inner openwork having a plurality of saidstraight strips spaced therearound and extending radially outwardsubstantially beyond the cylindrical plane defined by the said undulatedstrips thereof; said inner openwork forming a re|atively strong,coarse-apertured support; an outer said openwork encircling said inneropenwork and supported thereby, said outer openwork having a pluralityof said straight strips and undulated strips the said straight stripsbeing spaced therearound and extending radially inward substantiallybeyond the cylindrical plane defined by the said undulated strips, saidouter openwork forming a relatively thin, fine-apertured screen; andmeans for firmly anchoring the inwardly projecting portions of the saidstraight strips of said outer openwork to the outwardly projectingportions of said straight strips of said inner openwork to f'orm aunitary composite honeycomb roll.

1. In a rotary cylindrical roll of the type comprising a pair ofspaced-apart, parallel, circular end members each having an annularperipheral inner face and a plurality of alternate straight strips andbent strips, extending axially between and spaced around, the saidannular, inner faces of said members to form a cylindrical openwork,said bent strips each having uniformly spaced, flattened nodes inengagement with straight strips on each side thereof; and meansconnecting each said node to the adjacent straight strip for mutualsupport of said strips, the improvement whereby said straight stripsextend radially beyond said bent strips, around said roll.
 2. Apparatusas defined in claim 1 wherein the length of radial extension of saidstraight strips above said quantitative bent strips is less than theradial distance of said straight strips which is adjacent to said bentstrips.
 3. Apparatus as defined in claim 1 wherein circumferentiallyadjacent ones of said bent strips are oppositely disposed to form ahoneycombed-type openwork.
 4. Apparatus as defined in claim 1 wherein aportion of said nodes are cut out from at least the outer edges thereofand said connecting means is a fillet weld partially filling said cutoutto form a tapered face, thereby providing an improved fluid flow throughthe apparatus.
 5. A honeycomb roll of the type having alternate straightand undulated thin strips extending axially from one end of the roll tothe other end to define a half hexagonal patterned openworkcharacterized by each said straight strip extending radially outwardsubstantially beyond the cylindrical plane defined by said undulatedstrips, and anchoring means, in the said cylindrical plane of saidundulated strips, securing said strips to the adjacent portions of saidstraight strips to form a unitary, integral openwork.
 6. A roll asspecified in claim 5, wherein each said straight strip includes aplurality of spaced notches therealong for receiving and supporting theconvolutions of circumferentially extending metal tapes, or strips.
 7. Aroll as specified in claim 5, plus a hollow cylindrical, foraminousassembly, supported on the outer terminal edge portions of said straightstrips, said assembly being adapted to support a Fourdrinier wiretrained partially therearound.
 8. A roll as specified in claim 5,wherein said anchoring means comprises a plurality of cutouts, formed inat least the outer edge of each node of said undulates strips, and afillet weld extending around the periphery of each cutout and securingeach said node to the face of the adjacent straight strip.
 9. A roll asspecified in claim 8, wherein said fillet weld is beveled to form asloping, outward-facing edge on each said cutout.
 10. A honeycomb rollof the type having alternate straight and undulated thin stripsextending from one end of the roll to the other end to define a halfhexagonal patterned openwork, said roll being characterized by an innersaid openwork on said roll, said inner openwork having a plurality ofsaid straight strips spaced therearound and extending radially outwardsubstantially beyond the cylindrical plane defined by the said undulatedstrips thereof; said inner openwork forming a relatively strong,coarse-apertured support; an outer said openwork encircling said inneropenwork and supported thereby, said outer openwork having a pluralityof said straight strips and undulated strips the said straight stripsbeing spaced therearound and extending radially inward substantiallybeyond the cylindrical plane defined by the said undulated strips, saidouter openwork forming a relatively thin, fine-apertured screen; andmeans for firmly anchoring the inwardly projecting portions of the saidstraight strips of said outer openwork to the outwardly projectingportions of said straight strips of said inner openwork to form aunitary composite honeycomb roll.